21 static SOCKET s = INVALID_SOCKET;
23 static void raw_size(void);
25 static int sb_opt, sb_len;
26 static char *sb_buf = NULL;
27 static int sb_size = 0;
30 static void try_write (void) {
31 while (outbuf_head != outbuf_reap) {
32 int end = (outbuf_reap < outbuf_head ? outbuf_head : OUTBUF_SIZE);
33 int len = end - outbuf_reap;
36 ret = send (s, outbuf+outbuf_reap, len, 0);
38 outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK;
44 static void s_write (void *buf, int len) {
45 unsigned char *p = buf;
47 int new_head = (outbuf_head + 1) & OUTBUF_MASK;
48 if (new_head != outbuf_reap) {
49 outbuf[outbuf_head] = *p++;
50 outbuf_head = new_head;
56 static void c_write (char *buf, int len) {
62 * Called to set up the raw connection. Will arrange for
63 * WM_NETEVENT messages to be passed to the specified window, whose
64 * window procedure should then call raw_msg().
66 * Returns an error message, or NULL on success.
68 * Also places the canonical host name into `realhost'.
70 static char *raw_init (HWND hwnd, char *host, int port, char **realhost) {
78 if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
79 if ( (h = gethostbyname(host)) == NULL)
80 switch (WSAGetLastError()) {
81 case WSAENETDOWN: return "Network is down";
82 case WSAHOST_NOT_FOUND: case WSANO_DATA:
83 return "Host does not exist";
84 case WSATRY_AGAIN: return "Host not found";
85 default: return "gethostbyname: unknown error";
87 memcpy (&a, h->h_addr, sizeof(a));
88 *realhost = h->h_name;
94 port = 23; /* default telnet port */
99 s = socket(AF_INET, SOCK_STREAM, 0);
100 if (s == INVALID_SOCKET)
101 switch (WSAGetLastError()) {
102 case WSAENETDOWN: return "Network is down";
103 case WSAEAFNOSUPPORT: return "TCP/IP support not present";
104 default: return "socket(): unknown error";
108 * Bind to local address.
110 addr.sin_family = AF_INET;
111 addr.sin_addr.s_addr = htonl(INADDR_ANY);
112 addr.sin_port = htons(0);
113 if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
114 switch (WSAGetLastError()) {
115 case WSAENETDOWN: return "Network is down";
116 default: return "bind(): unknown error";
120 * Connect to remote address.
122 addr.sin_addr.s_addr = htonl(a);
123 addr.sin_port = htons((short)port);
124 if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
125 switch (WSAGetLastError()) {
126 case WSAENETDOWN: return "Network is down";
127 case WSAECONNREFUSED: return "Connection refused";
128 case WSAENETUNREACH: return "Network is unreachable";
129 case WSAEHOSTUNREACH: return "No route to host";
130 default: return "connect(): unknown error";
133 if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ |
134 FD_WRITE | FD_OOB | FD_CLOSE) == SOCKET_ERROR)
135 switch (WSAGetLastError()) {
136 case WSAENETDOWN: return "Network is down";
137 default: return "WSAAsyncSelect(): unknown error";
141 * We have no pre-session phase.
149 * Process a WM_NETEVENT message. Will return 0 if the connection
150 * has closed, or <0 for a socket error.
152 static int raw_msg (WPARAM wParam, LPARAM lParam) {
157 * Because reading less than the whole of the available pending
158 * data can generate an FD_READ event, we need to allow for the
159 * possibility that FD_READ may arrive with FD_CLOSE already in
160 * the queue; so it's possible that we can get here even with s
161 * invalid. If so, we return 1 and don't worry about it.
163 if (s == INVALID_SOCKET) {
169 if (WSAGETSELECTERROR(lParam) != 0)
170 return -WSAGETSELECTERROR(lParam);
172 switch (WSAGETSELECTEVENT(lParam)) {
175 ret = recv(s, buf, sizeof(buf), 0);
176 if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK)
178 if (ret < 0) { /* any _other_ error */
181 return -10000-WSAGetLastError();
191 ret = recv(s, buf, sizeof(buf), 0);
195 ret = recv(s, buf, 1, MSG_OOB);
197 if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK)
198 return -30000-WSAGetLastError();
201 if (outbuf_head != outbuf_reap)
205 return 1; /* shouldn't happen, but WTF */
209 * Called to send data down the raw connection.
211 static void raw_send (char *buf, int len) {
213 if (s == INVALID_SOCKET)
220 * Called to set the size of the window
222 static void raw_size(void) {
228 * Send raw special codes.
230 static void raw_special (Telnet_Special code) {
235 static SOCKET raw_socket(void) { return s; }
237 static int raw_sendok(void) { return 1; }
239 Backend raw_backend = {